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approach and landing using precision lateral and vertical
guidance with minima as determined by the category of
operation.
Note.- Lateral and vertical guidance refers to the
guidance provided either by:
a) a ground-based navigation aid; or
b) computer generated navigation data
ANNEX 6 - PART I1 2411 1/05
No. 24
Annex 6 - Operation of Aircrafl Part If
Categories of precision approach and landing operations:
Category I (CAT I) operation. A precision instrument
approach and landing with a decision height not lower
than 60 m (200 ft) and with either a visibility not less than
800 m or a runway visual range not less than 550 m.
Category II (CAT II) operation. A precision instrument
approach and landing with a decision height lower than
60 m (200 ft), but not lower than 30 m (100 ft), and a
runway visual range not less than 350 m.
Category IlIA (CATZIIA) operation. A precision instrument
approach and landing with:
a) a decision height lower than 30 m (100 ft) w no
decision height; and
b) a runway visual range not less than 200 m.
Category IZZB (CAT IIIB) operation. A precision instrument
approach and landing with:
a) a decision height lower than 15 m (50 ft) or no
decision height; and
b) a runway visual range less than 200 m but not less
than 50 m.
Category IIlC (CAT IIIC) operation. A precision instrument
approach and landing with no decision height and no
runway visual range Limitations.
Note.- Where decision height (DH) and runway visual
range (RVR) fall into different categories of operation, the
instrument approach and landing operation would be
conducted in accordance with the requirements of the most
demanding category (e.g. an operation with a DH in the range
of CAT IUA but with an RVR in the range of CAT IIIB would
be considered a CAT IIIB operation or an operation with a
DH in the range of CAT II but with an RVR in the range of
CAT I would be considered a CAT II operation).
Commercial air transport operation. An aircraft operation
involving the transport of passengers, cargo or mail for
remuneration or hire.
Dangerous goods. Articles or substances which are capable of
posing a risk to health, safety, property or the environment
and which are shown in the list of dangerous goods in the
Technical Instructions or which are classified according to
those Instructions.
Note.- Dangerous goods are classijied in Annex 18,
Chapter 3.
Decision altitude (DA) or decision height (DH). A specified
altitude or height in the precision approach or approach
with vertical guidance at which a missed approach must be
initiated if the required visual reference to continue the
approach has not been established.
Note 1 .- Decision altitude (DA) is referenced to mean sea
level and decision height (DH) is referenced to the threshold
elevation.
Note 2.- The required visual reference means that section
of the visual aids or of the approach area which should have
been in view for sufficient time for the pilot to have made an
assessment of the aircraft position and rate of cluurge of
position, in relation to the desiredjight path. In Category 111
operations with a decision height the required visual reference
is that specified for the particular procedure and operation.
Note 3.- For convenience where both expressions are
used they may be written in the form "decision
altitudeheight" and abbreviated "DA/HW.
Emergency locator transmitter (ELT). A generic tenn
describing equipment which broadcast distinctive signals
on designated frequencies and, depending on application.
may be automatically activated by impact or be manually
activated. An ELT may be any of the following:
AutomaticJixed ELT (ELT(AF)). An automatically activated
ELT which is permanently attached to an aircraft.
Automatic portable ELT (ELT(AP)). An automatically
activated ELT which is rigidly attached to an aircraft but
readily removable from the aircraft.
Automatic deployable ELT (ELT(AD)). An ELT which is
rigidly attached to an aircraft and which is automatically
deployed and activated by impact, and, in some cases,
also by hydrostatic sensors. Manual deployment is also
provided.
Survival ELT (ELT(S)). An ELT which is removable from an
aircraft, stowed so as to facilitate its ready use in an
emergency, and manually activated by survivors.
Flight crew member. A licensed crew member charged with
duties essential to the operation of an aircraft during a flight
duty period.
Flight manual. A manual, associated with the certificate of
airworthiness, containing limitations within which the
　
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